JP2501433Y2 - Silencer shell structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shell structure of a silencer, and in particular, a plate material in which flat portions and wavy portions are alternately formed continuously is provided between flat portions. The present invention relates to a shell structure of a silencer formed by winding at least three times so that a wavy portion is located.

[Conventional technology]

Generally, in a vehicle exhaust system, a muffler as disclosed, for example, in Japanese Utility Model Laid-Open No. 62-111919 is arranged in order to reduce exhaust noise.

FIG. 8 and FIG. 9 show the shell structure of the silencer disclosed in this publication, and reference numeral 11 denotes the silencer arranged in the exhaust system of the vehicle.

In this muffler 11, a partition wall 15 is arranged inside a tubular shell body 13, whereby a plurality of chambers are defined within the tubular shell body 13.

Cap-shaped end plates 17 are fitted to both ends of the tubular shell body 13, and the end plates 17 are fixed to the tubular shell body 13 by welding, for example.

Further, an exhaust pipe 19 is inserted through the end plate 17 and opened in the first expansion chamber 21.

As shown in FIG. 8, the tubular shell body 13 has a flat portion.
A plate material in which 23 and wavy portions 25 are alternately formed continuously is wound in three layers so that the wavy portions 25 are located between the flat portions 23 and the wavy portions 25 are located in the first expansion chamber 21. It is formed by turning, and both ends of the plate material are spot welded.

In the muffler 11 configured as described above, the exhaust gas flows into the muffler 11 via the exhaust pipe 19 and exhaust noise can be reduced.

Further, since the corrugated portion 25 is located in a triple structure in the portion of the tubular shell body 13 corresponding to the first expansion chamber 21, the tubular shell corresponding to the first expansion chamber 21 in which the transmitted sound is most likely to be generated. A large number of spaces 27 are formed in the main body 13, and the generation of transmitted sound from this part can be reduced.

[Problems to be solved by the device]

However, in such a silencer shell structure,
Since the wavy portion 25 is located in a triple structure in the portion of the tubular shell body 13 corresponding to the first expansion chamber 21, the tubular shell body 13 in the portion where the wavy portion 25 is located is reinforced, The other parts were not reinforced. Therefore, when the plate thickness of the plate material forming the tubular shell body 13 is reduced, there is a portion in which the rigidity of the tubular shell body 13 is reduced, and there is a problem that the weight reduction of the silencer 11 cannot be promoted. .

In this case, the tubular shell body corresponding to the first expansion chamber 21
When the corrugated portion 25 is formed in the entire exhaust gas flow direction to reinforce the parts other than 13, the entire tubular shell body 13 can be reinforced, but the end plate 17 is caulked to form the tubular shell body 13. There was a problem that could not be fixed to.

The present invention has been made in order to solve the above problems, and is of a silencer capable of reinforcing the entire tubular shell body and caulking an end plate to the tubular shell body. It is intended to provide a shell structure.

[Means for Solving the Problems]

The silencer shell structure of the present invention is a silencer shell structure in which both ends of the tubular shell body are closed by crimping end plates to both ends of the tubular shell body. , A plate member in which flat portions and wavy portions are alternately formed continuously, the wavy portion is located between the inner peripheral portion and the outer peripheral portion over the entire circumference of the flat portion and the entire length and the entire circumference of the silencer. So that the flat portion is wound at least three times, and both ends of the flat portion are extended from the both ends of the wavy portion to form extended portions, and the extended portions are brought into contact with each other and caulked. The end plates are crimped to the crimped portions.

[Action]

In the shell structure of the muffler of the present invention, a tubular shell body is formed by a plate member in which flat portions and wavy portions are alternately formed continuously between an inner peripheral portion and an outer peripheral portion over the entire circumference of the flat portion. The wavy portion is formed by winding at least three times so that it is located over the entire length and the entire circumference of the silencer, and both ends of the flat portion are
Since the extended portions are formed to extend beyond both ends of the wavy portion, the extended portions are brought into contact with each other to form the crimped portions, and the end plates are crimped to the crimped portions. Has a triple-layer structure in which the corrugated portion is located between the inner peripheral portion and the outer peripheral portion over the entire circumference of the flat portion and over the entire length and the entire circumference of the silencer, and the rigidity of the tubular shell body is improved. And the end plates are crimped to the crimped portions formed at both ends of the tubular shell body.

〔Example〕

The present invention will now be described in detail with reference to an embodiment shown in the drawings.

1 to 4 show an embodiment of the shell structure of the muffler of the present invention. In the drawings, reference numeral 31 denotes an elliptic cylindrical shell body.

As shown in FIGS. 5 and 6, the tubular shell main body 31 has a plate member 39 in which flat portions 33, 35 and corrugated portions 37 are alternately formed continuously as shown in FIGS. 1 and 7. As shown, the corrugated portion 37 is triple-positioned between the inner peripheral portion and the outer peripheral portion of the inner flat portion 33 and the outer flat portion 35 so as to be positioned over the entire length and the entire periphery of the tubular shell body 31. It is formed by winding.

Then, as shown in FIG. 5, both ends of the flat portions 33, 35 in the exhaust gas flowing direction R extend in the exhaust gas flowing direction R more than both ends of the wavy portion 37, and both ends of the flat portions 33, 35. Extended to 4
0 is formed.

That is, the plate member 39 is formed by pressing the corrugated portion 37, for example.
At the same time that a wave is formed on the wavy portion 37, the width D ₁ of the flat portions 33 and 35 is changed to the width D of the wavy portion 37 by notching both ends of the wavy portion 37.
It is formed wider than ₂ , and both ends of the flat parts 33 and 35 are wavy parts 37.
Is wider than the both ends in the exhaust gas flow direction R by t. Therefore, the width of the extended portion 40 is t.

The waves of the wavy portion 37 are formed in the exhaust gas flow direction R.

Further, the lengths of the flat portions 33, 35 and the wavy portion 37 are formed to be the circumferential length of the tubular shell body 31.

That is, the corrugated portion 37 is wound more than the inner flat plate portion 33 wound inside.
Is long, and the outer flat plate portion 35 wound to the outside of the wavy portion 37 is formed longer.

As shown in FIG. 1 and FIG. 3, the end portion of the plate material 39 is welded by spot welding every time the plate material 39 is wound, whereby the winding of the tubular shell body 31 is prevented. Release is prevented.

Further, end plates 41 are caulked at both ends of the tubular shell body 31 in the exhaust gas flow direction R, and both ends of the tubular shell body 31 are closed by these end plates 41.

That is, as shown in FIG. 4, the extended portions 4 of the flat portions 33 and 35 are
The two caulking parts are brought into contact with each other to form crimped portions 43, and by crimping the end plates 41 to these crimped portions 43, both ends of the tubular shell main body 31 are closed.

As shown in FIG. 5 and FIG. 6, such a silencer includes a plate member 39 in which flat portions 33, 35 and corrugated portions 37 are continuously formed alternately as shown in FIG. The corrugated portion 37 is wound in triple layers between the inner and outer peripheral portions of the portions 33 and 35 so as to be located over the entire length and the entire periphery of the tubular shell body 31, and is shown in FIG. As described above, spot welding is performed for each winding of the plate material 39, and the extending portions 40 of the flat portions 33 and 35 protruding in the exhaust gas flow direction R of the tubular shell body 31 are contacted with each other as shown in FIG. The caulked portions 43 are formed in contact with each other, and the end plates 41 are caulked to the caulked portions 43.

In the shell structure of the muffler configured as described above, as shown in FIGS. 1 and 2, the tubular shell main body 31
Has a triple-layer structure in which the corrugated portion 37 is located between the inner peripheral portion and the outer peripheral portion of the flat portions 33 and 35 over the entire circumference thereof, and the tubular shell main body 31 is positioned over the entire length and the entire circumference of the tubular shell body 31. The rigidity of the shell body 31 is improved, and the end plates 41 are caulked to the caulking portions 43 formed at both ends of the tubular shell body 31.

Thus, in the shell structure of the muffler configured as described above, the tubular shell body 31 is made up of the flat portions 33, 35 and the wavy portion 37.
, The plate member 39 formed continuously alternately, the wavy portion 37 between the inner peripheral portion and the outer peripheral portion over the entire circumference of the flat portions 33, 35 is located over the entire length and the entire circumference of the tubular shell body 31. In this way, the flat portions 33 and 35 are formed by three-fold winding so that both ends of the flat portion 33, 35 in the exhaust gas flowing direction R extend in the exhaust gas flowing direction R rather than both ends of the corrugated portion 37, and the extended portion 40 is formed. Since the extended portions 40 are formed in contact with each other to form the caulked portions 43, and the end plates 41 are caulked to the caulked portions 43, the tubular shell body 31
Has a triple-layer structure in which the corrugated portion 37 is located between the inner peripheral portion and the outer peripheral portion of the flat portions 33 and 35 over the entire circumference thereof, and the tubular shell main body 31 is positioned over the entire length and the entire circumference of the tubular shell body 31. The rigidity of the shell body 31 is improved, the entire tubular shell body 31 can be reinforced, and the end plates 41 can be easily crimped to the crimped portions 43 formed at both ends of the tubular shell body 31. it can.

Further, in the entire tubular shell body 31, the corrugated portion 37 is located between the inner peripheral portion and the outer peripheral portion over the entire circumference of the flat portions 33, 35, and is located over the entire length and the entire circumference of the tubular shell body 31. Due to the overlapping structure, an independent space layer 45 is formed over the entire tubular shell body 31.
However, since it is formed in parallel with the exhaust gas flow direction R, the sound transmitted from the tubular shell body 31 can be significantly reduced as compared with the conventional case.

Furthermore, since the rigidity of the entire tubular shell body 31 can be improved, the tubular shell body 31 can maintain a certain strength even if the plate material 39 has a small thickness, and the silencer can be made lightweight. Can be achieved.

In the above embodiment, the example in which the plate material 39 is wound three times has been described, but the present invention is not limited to the above embodiment, and the plate material may be wound four times or more. Of course.

Further, in the above embodiment, an example in which the plate material 39 is welded by spot welding every time it is wound and the wound plate material 39 is fixed has been described, but the present invention is not limited to the above embodiment, and the winding is performed. Of course, the plate material thus obtained may be fixed by another method.

Furthermore, in the above embodiment, an example in which the wave of the corrugated portion 37 is formed in the exhaust gas flowing direction has been described, but the present invention is not limited to the above embodiment, and the wave of the corrugated portion can be changed in the exhaust gas flowing direction. Even if it is formed in a plate material so as to be orthogonal to, the same effect as in the above embodiment can be obtained.

[Effect of device]

In the shell structure of the muffler of the present invention, a tubular shell body is formed by a plate member in which flat portions and wavy portions are alternately formed continuously between an inner peripheral portion and an outer peripheral portion over the entire circumference of the flat portion. The wavy portion is formed by winding at least three times so that it is located over the entire length and the entire circumference of the silencer, and both ends of the flat portion are
Since the extended portions are formed to extend beyond both ends of the wavy portion, the extended portions are brought into contact with each other to form the crimped portions, and the end plates are crimped to the crimped portions. Has a triple-layer structure in which the corrugated portion is located between the inner peripheral portion and the outer peripheral portion over the entire circumference of the flat portion and over the entire length and the entire circumference of the silencer, and the rigidity of the tubular shell body is improved. It is possible to reinforce the entire tubular shell body, and it is possible to crimp the end plates to the caulking portions formed at both ends of the tubular shell body.

Further, unlike the conventional example, the corrugated portion of the present invention is not provided with the flat portions for crimping at both ends, so that the corrugating process is extremely easy.

[Brief description of drawings]

FIG. 1 is a front view showing a cylindrical shell body in one embodiment of the silencer shell structure of the present invention. FIG. 2 is a side view showing a part of a silencer to which the present invention is applied by cutting out a part thereof. FIG. 3 is a perspective view of FIG. FIG. 4 is a vertical sectional view showing the caulked portion and its vicinity. FIG. 5 is a plan view showing a plate material. FIG. 6 is a side view of FIG. FIG. 7 is a side view showing a state in which the plate member of FIG. 5 is wound. FIG. 8 is a front view showing a tubular shell body in a conventional silencer shell structure. FIG. 9 is a side view showing a conventional silencer with a part cut away. [Explanation of symbols of main parts] 31 …… Cylindrical shell body 33 …… Inner flat part 35 …… Outer flat part 37 …… Wavy part 39 …… Plate material 40 …… Extended part 41 …… End plate 43… ... Crimping part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Kanematsu 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Co., Ltd. (56) References: 62-11919 (JP, U) -52023 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A silencer shell structure in which both end portions of a tubular shell body are crimped to close both ends of the tubular shell body, wherein the tubular shell body is corrugated with a flat portion. The plate member formed by alternately and continuously forming portions is at least 3 so that the corrugated portion is located between the inner peripheral portion and the outer peripheral portion of the flat portion over the entire length and the entire circumference of the silencer. Formed by winding heavily, both ends of the flat portion are extended from both ends of the wavy portion to form extended portions,
A shell structure of a silencer, characterized in that the extended portions are brought into contact with each other to form crimped portions, and the end plates are crimped to the crimped portions.